For a San Diego Rolex owner, check the reference number between the lugs at 12...

https://zoom-wiki.win/index.php/What_Are_%E2%80%9CComps%E2%80%9D_and_Why_Do_They_Matter_When_Selling_a_Rolex%3F

For a San Diego Rolex owner, check the reference number between the lugs at 12 o’clock before comparing offers. Have a trusted watchmaker remove the bracelet, and don’t post clear photos of the serial number or meet a buyer with the watch alone.